diff --git a/src/ol/events.js b/src/ol/events.js
index 8d53c2dad4..1740a6c072 100644
--- a/src/ol/events.js
+++ b/src/ol/events.js
@@ -105,7 +105,7 @@ ol.events.createListenOnce_ = function(target, type, listener, opt_useCapture, o
   var key = ol.events.getKey.apply(undefined, arguments);
   return function listenOnce(evt) {
     listener.call(opt_this || this, evt);
-    target.removeEventListener(evt.type, listenOnce, opt_useCapture);
+    target.removeEventListener(evt.type, listenOnce, !!opt_useCapture);
     --count;
     if (count === 0) {
       delete ol.events.listenersByKey_[key];
@@ -177,7 +177,7 @@ ol.events.listen = function(target, type, listener, opt_useCapture, opt_this) {
   var key = ol.events.getKey.apply(undefined, arguments);
   if (!ol.events.listenersByKey_[key]) {
     for (var i = 0, ii = types.length; i < ii; ++i) {
-      target.addEventListener(types[i], targetListener, opt_useCapture);
+      target.addEventListener(types[i], targetListener, !!opt_useCapture);
     }
     ol.events.listenersByKey_[key] = /** @type {ol.events.ListenerData} */ ({
       listener: targetListener,
@@ -248,7 +248,7 @@ ol.events.unlistenByKey = function(key) {
     var types = Array.isArray(type) ? type : [type];
     for (var i = 0, ii = types.length; i < ii; ++i) {
       listenerData.target.removeEventListener(types[i],
-          listenerData.listener, listenerData.useCapture);
+          listenerData.listener, !!listenerData.useCapture);
     }
     delete ol.events.listenersByKey_[key];
   }
diff --git a/src/ol/featureloader.js b/src/ol/featureloader.js
index ccc1e3cd68..79d3559e5d 100644
--- a/src/ol/featureloader.js
+++ b/src/ol/featureloader.js
@@ -65,7 +65,8 @@ ol.featureloader.loadFeaturesXhr = function(url, format, success, failure) {
       function(extent, resolution, projection) {
         var xhr = new XMLHttpRequest();
         xhr.open('GET',
-            goog.isFunction(url) ? url(extent, resolution, projection) : url);
+            goog.isFunction(url) ? url(extent, resolution, projection) : url,
+            true);
         if (format.getType() == ol.format.FormatType.ARRAY_BUFFER) {
           xhr.responseType = 'arraybuffer';
         }
diff --git a/src/ol/map.js b/src/ol/map.js
index cee10e9489..bb060653a0 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -1063,7 +1063,7 @@ ol.Map.prototype.handleTargetChanged_ = function() {
     goog.dom.removeNode(this.viewport_);
     if (this.handleResize_ !== undefined) {
       goog.global.removeEventListener(ol.events.EventType.RESIZE,
-          this.handleResize_);
+          this.handleResize_, false);
       this.handleResize_ = undefined;
     }
   } else {
@@ -1078,7 +1078,7 @@ ol.Map.prototype.handleTargetChanged_ = function() {
     if (!this.handleResize_) {
       this.handleResize_ = this.updateSize.bind(this);
       goog.global.addEventListener(ol.events.EventType.RESIZE,
-          this.handleResize_);
+          this.handleResize_, false);
     }
   }
 
diff --git a/src/ol/source/tilejsonsource.js b/src/ol/source/tilejsonsource.js
index f7ccb4c4f1..7c8e52c355 100644
--- a/src/ol/source/tilejsonsource.js
+++ b/src/ol/source/tilejsonsource.js
@@ -44,7 +44,7 @@ ol.source.TileJSON = function(options) {
         this.handleTileJSONError.bind(this));
   } else {
     var xhr = new XMLHttpRequest();
-    xhr.open('GET', options.url);
+    xhr.open('GET', options.url, true);
     xhr.onload = function(e) {
       if (xhr.status < 400) {
         var response = /** @type {TileJSON} */(JSON.parse(xhr.responseText));